Brocade Communications Systems FastIron Administration Manual page 341

FIGURE 9
PoE midspan method
The PoE Midspan method uses an intermediate device, usually another PD, to inject power into the
network. The intermediate device is positioned between the switch and the PD and delivers power over
the network using the spare pairs of wires (Alternative B). The intermediate device has multiple
channels (typically 6 to 24), and each of the channels has data input and a data-plus-power RJ-45
output connector.
The Midspan method is illustrated in the following figure.
FastIron Ethernet Switch Administration Guide
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PoE midspan method
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